Apparatus for rolling metal bars.



I. L. HUGHES. APPARATUS FOR ROLLING METAL BARS.

APPLICATION FILED D30. 7, 1908.

Patented Jan 25, 1910.

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I. L. HUGHES.

APPARATUS FOR ROLLING METAL BARS.

APPLICATION FILED DEC. 7, 1908 Patented Jan.25, 1910.

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INVENTOR WITNESSES I. LPHUGHBS. APPARATUS FOR ROLLING METAL .BARS. APPLICATION FILED DEC. 7, 1908.

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Patented Jan. 25, 1910.

ISAAC LAMONT HUGHES, OF YOUNGSTOWN, OHIO.

APPARATUS FOR ROLLING METAL BARS.

Specification of Letters Patent.

Patented Jan. 25, 1910.

Application filed December '7, 1908. Serial No. 466,247.

To all whom it may concern:

Be it known that I, Isaac LAMONT IIUGI-IES, of Youngstown, Mahoning county, Ohio, have invented a new and useful Apparatus for Rolling Metal Bars, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which-- Figure 1 is a side elevation showing the preferred form of apparatus as applied to the finishing rolls of a rolling mill in carrying out my invention and Fig. 2 is an end elevation of the same; Fig. 3 is a side elevation showing a modified form of apparatus applied to the finishing rolls of a rolling mill; Fig. 4 is an end elevation of the stand of ironing rolls shown in Fig. 3 and forming part of my invention; and Fig. 5 is a front elevation of a finishing stand of rolls showing the manner in which the center line of the several finishing passes therein arranged on an angle to the axes of the ro s.

My invention relates to the rolling of metal bars having a rectangular cross section and it particularly relates to the manufacture of bars known to the trade as nut bars.

Heretofore in rolling such material the center line of the finishing pass has usually been in a horizontal plane which is parallel with the horizontal axes of the rolls forming the finishing rolls. When the passes are formed in this manner, it is extremely difiicult to get the desired sharp edges on the corners of the bars, while in cases where the center line of the finishing pass has been at an angle to the axes of the finishing rolls, the bars 011 emerging from the finishing pass will twist, in some cases to such an extent that the length of the bar which can be rolled must be materially lessened in order to prevent the bar twisting throughout an entire revolution during its passage through the finishing pass. Such bars, to be marketable, must be exactly straight and without any twist or wind, and where the bars are finished in a pass whose center line'is at an angle to the axes of the rolls, it becomes necessary to straighten the bars while still hot after being finished in the rolling mill in order to finish them in proper condition for the market. This straightening opera tion has been performed by hand, before the bars have become cooled, after the completion of the rolling operation and, being a slow operation, decreases the output of such mills, and also adds greatly to the expense of finishing the bars.

The object of the invention is to provide improved means whereby bars of rectangular cross section are rolled with clean, sharp corners or edges and means by which bars are finished straight and flat without having any twist in their length, that is, a center line through any transverse section in a bar will coincide with a similar center line through any other like cross section in the length of the bar.

In the drawings, 2 and 3 represent the top and bottom rolls of a two-high stand of finishing rolls, having a series of finishing passes 64 provided therein which are inclined at an angleto the axes of the rolls, as shown in Fig. 5 and which are duplicate passes, although the several passes may be for different sizes of bars or a single pass may be provided when desired. As the bar issues from the finishing rolls, it is delivered by the guide a into the pass formed between the ironing rolls 5, and 6 these rolls having plane surfaces acting upon two opposite sides of the bars and being set at a distance apart equal to the thickness of the bar coming from the finishing rolls. The center line of the pass formed by'and between the ironing rolls 5 and 6 is exactly parallel with that of the pass or passes in the finishing stand of rolls and, as the angle of the passes in the finishing rolls 2 and 3 will vary with provided to permit of the'ironing rolls being adjusted toward and away from each other to suit the different thicknesses of bars rolled and to be adjusted to the dififerent angles in which these rolls must be placed.

different sizes of bars, suitable means are As shown in Figs. 1 and 2, the guide t is mounted on a rest bar 4: which is rigidly secured in place with relation to the roll housings in which the "rolls 2 and 8 are mounted. The guide 4 is'provided on its outer end with a flanged on which the slide plate 7 is rotatably secured by the bolts or studs 7 The outer face of the slide plate 7 i is provided with a recessed for the ironing rolls 5 and 6 are mountedso as tobe laterally movable, the housin s be ing adjusted, sidewise and held in their ad-, justed position by the adjusting screws 9 which are mounted in'the screw threaded dovetailed groove in which the housings. 8

lugs or bosses 9 on the slide plate 7 The slide plate 7 is rotated to vary the angle of the axes of the rolls 5 and 6 and is held in its adjusted position by means of the adjusting screw 10 which is mounted on the adjusting screw nut 1O on the flange 1* and is secured to the boss 7 b on the slide plate 7. The rolls 5 and 6 are rotatably secured in roll bearings 11 and 12 and these bearings, with their rolls are adjustable toward and away from each other, being held in their adjusted position by means of the housing screws 13 and liners 18 In the modification shown in Figs. 3 and 1 the housings 8 for the rolls 5 and 6 are mounted upon supporting shoes or bed plates 14: in proximity to the finishing rolls 2 and 3 which are shown mounted in the roll housings 15, the guide 4: in this case extending between the housing 15 and the housings 8 to lead the metal from the finishing pass of the finishing rolls 2 and 3 into the ironing pass formed between the ironing rolls 5 and 6. The rolls 5 and 6 must be adjusted so as to bring the angle of the sides of the pass formed between these rolls to exactly the same angle as the angle of the corresponding sides of the passes formed in the finishing rolls 2, 3. The manner of adjusting these rolls in the apparatus shown in Figs. 3 and 4c is slightly different from that shown in Figs. 1 and 2. In this case, the bearings 5 and 6 for the rolls 5 and 6 are mounted in the carriers 16, 17 so as to rock in these carriers. The lower carriers 16 are adjusted vertically by means of the tapering wedge blocks 18 which contact with the tapering faces 16 of the bottom bearing carriers 16 which are mounted so as to be vertically movable in the windows of the housings 8 The top carriers 17 are carried on the housing screws 17 17 and are adjusted vertically by turning these screws. In adjusting the rolls 5 and 6 in the apparatus shown in Figs. 3 and 4c, the wedge blocks 18 are moved sidewise in the windows of the housings 8* by means of the wedge adjusting screws 1919 this operation raising or lowering the carriers 16 independently of each other. The housing screws 18 are then adjusted separately so as to bring the axis of the roll 5 exactly parallel with that of the roll 6, the roll 6 having first been brought to exactly the same angle relative to the axis of the finishing roll in front of the ironing rolls 5 as the center line of the pass in the finishing rolls and care is taken to keep the rolls 5 and 6 separated the right distance apart to permit of the finished bar passing between them without causing any reduction in its thickness.

In carrying out the method of rolling bars by my improved apparatus, the bar is reduced in the roughing rolls in the usual manner. In the last two passes the bar is finished in the preceding pass.

finished to the desired cross sectional area and shape and by reason of the passes being arranged at an angle with the axes of the rolls, the corners of the bar are formed with sharp clean edges diagonally opposite corners being finished in the finishing pass after the other two diagonal corners have been hen the bar emerges from the finishing stand of rolls, it is delivered between the ironing rolls 5 and 6, these rolls being set so as to form a pass having its center line coinciding with the center line of the finishing pass in the finishing rolls. By this means the speed at which the four corner portions of the bar is moving is equalized, twisting of the bar due to the unequal surface speeds of the contacting faces of the finishing pass is prevented and any tendency of twisting present in the bar as it leaves the finishing rolls is removed by the action of the ironing rolls and the bar is delivered from the rolls in a flat and straight condition and without any twist whatever. The ironing rolls are preferably placed as closely to the finishing rolls as is permissible, in order that the momentum of the bar in leaving the finishing rolls 2 and 3 will cause the bar to be carried through the ironing rolls 5 and 6 and avoid the necessity for positively driving the ironing rolls although the ironing rolls may be positively driven when desired.

The advantages of my invention will be appreciated by those skilled in the art. By the use of my improved ironing rolls, bars of rectangular cross section can be finished with much cleaner and sharper edges or corners than has heretofore been possible and the bars can be finished without any twist. As the bars are finished without twisting, the necessity for hot straightening the bars is avoided and, as this has always been the cause of delay in the 0])61'2ttl0l] of the mill, the output of the mill is very largely increased, there being no delays at the finishing end of the mill. As there is no twisting of the finished bars, the mill can be operated at a faster speed and in this way can be finished hotter than heretofore which is an advantage in that it results in sharper corners being formed than has heretofore been possible and fins are prevented from forming, as is the case when the bars are finished at a lower temperature. By providing the ironing rolls the surface speed of the corner portions of the bar is equalized and twisting of the bars is overcome and prevented.

Modifications in the construction and arrangement of the parts may be made without departing from my invention and changes may be made in the arrangement and location of the parts relative to each other within the scope of the claims. In. some cases with a high speed mill having an extra long hot bed, the ironing rolls may be used in connection with a stand of pinch rolls, in which case the bars will be finished and will then be caused to pass through the stand of pinch rolls and its adjoining ironing rolls, in order to iron the bars and prevent or remove any twist present in the bars after being finished in the finishing pass of the rolling mill.

I claim 1. Apparatus for rolling metal bars comprising rolls having a final finishing passin which the cross sectional area and shape of the bar is fixed, the center line of said finishing pass being at an angle to the axes of the finishing rolls, and ironing rolls forming a pass into which the bar is delivered from the finishing pass, the center line of the ironing pass being parallel to the axes of the ironing rolls and to the angular center line of the finishing pass in the finishing stand of rolls; substantially as described.

2. Apparatus for rolling metal bars comprising rolls having a rinal finishing pass in which the cross sectional area and shape of the bar is fixed and ironing rolls forming an ironing pass through which the bar is delivered from said finishing pass, the axes of the ironing rolls being at an angle to the axes of the finishing rolls, and the center line of the ironing pass being parallel with the corresponding center line of the finishing pass; substantially as described.

8. Apparatus for rolling metal bars com prising roughing and finishing rolls having reducing passes therein in which the metal is elongated and its cross sectional area is fixed and a supplemental stand of ironing :rolls having an ironing pass therein into which the metal is delivered without twisting from the finishing pass of the finishing rolls, the finishing pass having its center line at an angle to the axes of the finishing rolls and the ironing pass in the ironing rolls having its center line parallel with the axes of the ironing rolls the axes of the ironing rolls being at an angle to the axes of the finishing rolls; substantially as described.

4. Apparatus for rolling metal bars comprising rolls having a final finishing pass in which the cross sectional area and shape of the bar is fixed and ironing rolls forming an ironing pass through which the bar is delivered without twisting from said finishing pass, the axes of the ironing rolls being at an angle to the axes of the finishing roll; substantially as described.

5. Apparatus for rolling metal bars comprising rolls having a final finishing pass in which the cross sectional area and shape of the bar is fixed and a stand of ironing rolls having an ironing pass therein in which the metal is delivered from the finishing pass of the finishing rolls, the center line of the finishing pass being at an angle to the axes of the finishing rolls, the ironing pass in the ironing rolls being parallel with the axes of the ironing rolls and the center line of the ironing pass being parallel with the corresponding center line of the finishingpass in the finishing rolls; substantially as described.

In testimony whereof, I have hereunto set my hand.

' ISAAC LAMONT HUGHES.

Witnesses:

OSCAR U. Goon, RAY MCLAUGHLIN. 

